fix: follow ruff linter guides to remove unused alternative import an…

…d thus remove sys import

scripts/gen_credits.py

@@ -3,7 +3,7 @@
 from __future__ import annotations
 
 import re
-import sys
+from importlib.metadata import PackageNotFoundError, metadata
 from itertools import chain
 from pathlib import Path
 from textwrap import dedent
@@ -13,11 +13,6 @@
 from jinja2 import StrictUndefined
 from jinja2.sandbox import SandboxedEnvironment
 
-if sys.version_info < (3, 8):
-    from importlib_metadata import PackageNotFoundError, metadata
-else:
-    from importlib.metadata import PackageNotFoundError, metadata
-
 project_dir = Path(".")
 pyproject = toml.load(project_dir / "pyproject.toml")
 project = pyproject["project"]